Patent US3769144A successfully refreshed from Google Patents.
US3769144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quilted fabric containing high surface area carbon fibers
Assignee: Unifrax I LLC
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Filing: 1972-03-24
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Granted: 1973-10-30
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Expires: 1992-03-24
Abstract
Abstract A quilted fabric containing high surface area carbon fibers is made by uniting a central layer of flexible activated carbon fibers between a pair of outer layers of reinforcing fabric, positioned on each side of the layer of activated flexible carbon fibers, with a network of quilting stitching. The quilted fabric thus made is useful for fabricating protective clothing or gas masks for use by personnel who must enter areas which may contain noxious gases, or for face masks for combatting the air pollution problem. The quilted fabric makes possible the use of spun yarns of activated carbon fabric which have, per se, low tensile strength, but which can be made more economically than continuous filaments of higher tensile strength.
Inventors
- 👤 J Economy
- 👤 R Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:27
CPC Classifications
A; A62; A62D; A62D5/00; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/06; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/0269; B32B2262/10; B32B2262/106; B32B2309/00; B32B2309/02; B32B2571/00; Y; Y10; Y10S; Y10S264/00; Y10S264/29; Y10S273/00; Y10S273/23; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/30; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/153; Y10T442/30; Y10T442/3472; Y10T442/348; Y10T442/3496
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
further heating said fiber in a nonoxidizing atmosphere from said intermediate temperature to a final temperature in the range of from about 700*C to about 900*C, at a rate of temperature rise of from about 50*C/hr to about 200*C/hr.
Claim 2
Dependent Claim
18 words
The quilted fabric of claim 1, wherein the central layer of flexible carbon fibers is woven carbon cloth.
Claim 3
Dependent Claim
23 words
a pair of outer layers of reinforcing fabric, one layer being positioned on each side of the layer of flexible carbon fibers; and
Claim 4
Dependent Claim
25 words
a network of quilting stitching, uniting the central layer of flexible carbon fibers and the outer layers of reinforcing fabric into an integral quilted fabric.
Claim 5
Dependent Claim
17 words
The quilted fabric of claim 1, wherein the central layer of flexible carbon fibers is carbon felt.
Claim 6
Dependent Claim
19 words
The quilted fabric of claim 1, wherein the central layer of flexible carbon fibers is resin bonded carbon batting.
Claim 7
Dependent Claim
23 words
The quilted fabric of claim 1, wherein the central layer of flexible carbon fibers is a multiplicity of loose staple fibers of carbon.
Claim 8
Dependent Claim
16 words
The quilted fabric of claim 1, comprising a plurality of central layers of flexible carbon fibers.
Claim 9
Dependent Claim
16 words
The quilted fabric of claim 1, wherein the outer layers of reinforcing fabric are nylon cloth.
Claim 10
Dependent Claim
14 words
The quilted fabric of claim 7, wherein the nylon is a wholly aromatic polyamide.
Claim 11
Dependent Claim
17 words
The quilted fabric of claim 1, wherein the outer layers of reinforcing fabric are uncarbonized CA-0001 cloth.
Claim 12
Dependent Claim
22 words
The quilted fabric of claim 1, wherein the method of producing the central layer of flexible carbon fibers comprises the steps of
References Cited (Backward Citations)
US3203849A
Cited
US3405674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |